{"title":"水和水蒸气环境下铝合金颗粒结晶过程中的传热特性分析","authors":"M. V. Zharov","doi":"10.1134/s2075113324010313","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The results obtained using the developed mathematical model of a detailed change in the temperature field and the phase transitions during cooling and crystallization of a melt droplet under cooling in the water and water–steam environment are analyzed. The presented mathematical model not only allows one to establish temperature fields in the droplet or granule body but also determines the velocity of motion of a droplet in a coolant at each specific instant of time, the intensity of heat removal, the cooling rate, and the melt crystallization rate at different points in the volume. The aforementioned ultimately makes it possible to predict dendrite sizes and the properties and phase composition of a material of synthesized granules. The mathematical model has been tested in granulation of aluminum superalloys (D1 and D16 alloys of the Al–Cu–Mg system and V95 and V96Ts alloys of the Al–Zn–Mg–Cu system) obtained by centrifugal spraying of melt and the drop method upon cooling in a water environment. The rate of crystallization in natural samples has been measured by analyzing the dendritic parameter of the material structure. The mathematical model has demonstrated a high degree of convergence of the results of simulation modeling and the results of real experiments for production of granules. The model has yielded, in particular, fairly accurate results of the formation of granules at ultrahigh crystallization rates without a “steam jacket,” i.e., a vapor layer appearing between the granule body and the coolant, reducing the heat removal intensity and preventing the growth of the crystallization rate owing to the lower thermal conductivity of water vapor.</p>","PeriodicalId":586,"journal":{"name":"Inorganic Materials: Applied Research","volume":null,"pages":null},"PeriodicalIF":0.5000,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Analysis of Features of Heat Transfer during Crystallization of Aluminum Alloy Granules in a Water and Water–Steam Environment\",\"authors\":\"M. V. Zharov\",\"doi\":\"10.1134/s2075113324010313\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<h3 data-test=\\\"abstract-sub-heading\\\">Abstract</h3><p>The results obtained using the developed mathematical model of a detailed change in the temperature field and the phase transitions during cooling and crystallization of a melt droplet under cooling in the water and water–steam environment are analyzed. The presented mathematical model not only allows one to establish temperature fields in the droplet or granule body but also determines the velocity of motion of a droplet in a coolant at each specific instant of time, the intensity of heat removal, the cooling rate, and the melt crystallization rate at different points in the volume. The aforementioned ultimately makes it possible to predict dendrite sizes and the properties and phase composition of a material of synthesized granules. The mathematical model has been tested in granulation of aluminum superalloys (D1 and D16 alloys of the Al–Cu–Mg system and V95 and V96Ts alloys of the Al–Zn–Mg–Cu system) obtained by centrifugal spraying of melt and the drop method upon cooling in a water environment. The rate of crystallization in natural samples has been measured by analyzing the dendritic parameter of the material structure. The mathematical model has demonstrated a high degree of convergence of the results of simulation modeling and the results of real experiments for production of granules. The model has yielded, in particular, fairly accurate results of the formation of granules at ultrahigh crystallization rates without a “steam jacket,” i.e., a vapor layer appearing between the granule body and the coolant, reducing the heat removal intensity and preventing the growth of the crystallization rate owing to the lower thermal conductivity of water vapor.</p>\",\"PeriodicalId\":586,\"journal\":{\"name\":\"Inorganic Materials: Applied Research\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.5000,\"publicationDate\":\"2024-05-23\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Inorganic Materials: Applied Research\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1134/s2075113324010313\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Inorganic Materials: Applied Research","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1134/s2075113324010313","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Analysis of Features of Heat Transfer during Crystallization of Aluminum Alloy Granules in a Water and Water–Steam Environment
Abstract
The results obtained using the developed mathematical model of a detailed change in the temperature field and the phase transitions during cooling and crystallization of a melt droplet under cooling in the water and water–steam environment are analyzed. The presented mathematical model not only allows one to establish temperature fields in the droplet or granule body but also determines the velocity of motion of a droplet in a coolant at each specific instant of time, the intensity of heat removal, the cooling rate, and the melt crystallization rate at different points in the volume. The aforementioned ultimately makes it possible to predict dendrite sizes and the properties and phase composition of a material of synthesized granules. The mathematical model has been tested in granulation of aluminum superalloys (D1 and D16 alloys of the Al–Cu–Mg system and V95 and V96Ts alloys of the Al–Zn–Mg–Cu system) obtained by centrifugal spraying of melt and the drop method upon cooling in a water environment. The rate of crystallization in natural samples has been measured by analyzing the dendritic parameter of the material structure. The mathematical model has demonstrated a high degree of convergence of the results of simulation modeling and the results of real experiments for production of granules. The model has yielded, in particular, fairly accurate results of the formation of granules at ultrahigh crystallization rates without a “steam jacket,” i.e., a vapor layer appearing between the granule body and the coolant, reducing the heat removal intensity and preventing the growth of the crystallization rate owing to the lower thermal conductivity of water vapor.
期刊介绍:
Inorganic Materials: Applied Research contains translations of research articles devoted to applied aspects of inorganic materials. Best articles are selected from four Russian periodicals: Materialovedenie, Perspektivnye Materialy, Fizika i Khimiya Obrabotki Materialov, and Voprosy Materialovedeniya and translated into English. The journal reports recent achievements in materials science: physical and chemical bases of materials science; effects of synergism in composite materials; computer simulations; creation of new materials (including carbon-based materials and ceramics, semiconductors, superconductors, composite materials, polymers, materials for nuclear engineering, materials for aircraft and space engineering, materials for quantum electronics, materials for electronics and optoelectronics, materials for nuclear and thermonuclear power engineering, radiation-hardened materials, materials for use in medicine, etc.); analytical techniques; structure–property relationships; nanostructures and nanotechnologies; advanced technologies; use of hydrogen in structural materials; and economic and environmental issues. The journal also considers engineering issues of materials processing with plasma, high-gradient crystallization, laser technology, and ultrasonic technology. Currently the journal does not accept direct submissions, but submissions to one of the source journals is possible.